Tap-leading chuck.



D. C. KLAUSMEYER.

TAP LEADING CHUCK.

APPLICATION FILED 1AN.29. 1914.

Patent-ed May 25, 1915.

@anni @Klamm/www; .7m/MHH.'

@fabula/u..

' members with a ball bearing'spline for fa- @AVID C. KLUSMEYEB, OIE'HAMILTON COUNTY, OHIO, `vASSIGNOR TO THE CINCINNTI- BICKFOBD TOOLCOMPANY, 0F OAKLEY, OHIO, A CORPORATION 0F OHIO.

TAP-Leanne oHUcK.

chucks of the classadapted tov the use oftapping or drilling machines orfor other suitable purposes, and the objects of my improvements are toprovide anti-friction means for facilitating the automatic longitudinalmovement of the tap; to provide an anti-friction spline between twoconcentric members'for facilitating their, relative longitudinalmovement; to provide concentric cilitating their relative longitudinalmovement when being rotated against heavy resistance, and to providedurable and l; compact construction and assemblage of the variousmembers for securing facility of operation and efficiency of action.AThese objects may be attained inthe followingA described, manner asillustrated in the accompanying drawings, in which:

Figures 1 and 2 are longitudinal diametrical sectionsl on re ectiveperpendicular axial planes of a tap eading chuck embodylng myimprovements; Fig. 3 .a plan, and

Fig. 4 a section on the line a-a of Fig. 3..

In the drawings, 1 represents, the longitudinally movable spindle whichmay be rotated in either of opposite directions in the usual manner andis formed with a tapered axial opening 2 and terminates in a. clutchmember 3. The cylindrical body 4 of the chuck is formed with oppositelyvdisposed plane surfaces 5, a groove 17 and w1th a clutch member 6, andprovided with a tav per shank 7 whereby it may be removably secured inthe taper opening 2 with the clutch members 3 and6 in engagement.

Oblong plugs 8 formed with semi-circular ends 9 may be secured by means`/ovpins 11 in recesses v12 formed in the respe'ctive plane surfaces onthe body 4. Spline sections'13 and 14 secured on the body by means of,

screws or pins 15 terminate at their adja- 'cent ends in semi-circularconcave lformi concentric'with and a short distance from' thecorresponding ends 9 of the interven-- ing plugs 8 as shown in Fig/4.

Specification of Letters Patent.

Patented May es, aars.

Application filed January 29, 1.914. erial No. 815,299.

A sleeve 16 slidably mounted on the body 4 is formed with interiorlongitudinal grooves or channels 18 for inolosingthe cortap socket 22secured on the sleeve by means of the key 23 is `formed with arectangular axial opening 24 wherein "a tap 25 may be removably securedby means of the screw 26. The sc 'w 27 inserted through the wall of thesleev projects within the grooye 1'( for limiting ythe relativelongitudinal movement of the sleeve and body.

ln operation, the spindle may bes moved to start the tap in the hole ofthe member to be threaded, and with the sleeve-moved to its most inwardliniit pn the body., the tap is properly started the furtherlongitudinal movement of the spindle should `'be discontinued The`automatic feeding movement of the tap will'be facilitated by lthefrictionless movement therewith of the sleeve in an outward direction onthe body.l After the tapping, of the hole is completed the directionofthe spindle may be reversed and the frictionless return of the sleevein an inward direction by the tap facilitates its automatic removal.

Having fullydescribed my improvement, what li claim as my invention anddesire to secure by Letters Patent of the United States is: y

1. The combination of concentric members, the one being Jformed `with aspline groove, the other being provided with a spline 'of less widththan the groove and movable therein,l anti-friction balls movable withinthe groove and around the spline, and means for preventing the escape ofthe balls from theends of Ithe groove. y

2. A tap -`leading chuck comprising concentric -members,`.t e one beingformed with a spline groove, the other ,being provided with a coactingspline having an intermediate portion of its length reduced in width andformed with passages acrossits respectiveends, and anti-friction ,ballsmovable .so A

After within said passages and between said reduced portion and theadjacent Walls of thev groove.

3. A tap leading ehuckVv-coniprising ooncentric cylindrical membersrelatively' mov-v able longitudinally, the one vbeing f formed l with alongitudinal groove', the other being- .provided with` a longitudinallug Amovable Within the fgroove, anti-frietionball`s movable within tbegroovev and around the lug therein, 'andfsplinesections movable Within lthe groove beyond, thev A'ends of vthe lug for retaining the ballstherein. l

A'balls fromene '.4. The combination of eoncentric members relativelymovable longitudinally, the

one being, formed with f Va.' longitudinal n DSC. KLAUSMEYER. fWtne'ssesz-u n S. C. SCHAUER,

AUG H. TUEGHTER.

